package com.nowcodercommunity.entity;

/**
 * 封装分页相关信息
 */
public class Page {

    //当前页码
    private int current = 1;
    //显示上限
    private int limit = 10;
    //数据总数(用于计算总页数)
    private int rows;
    //查询路径(服用分页链接)
    private String path;

    public int getCurrent() {
        return current;
    }

    public void setCurrent(int current) {
        if(current >= 1 && current <= getTotal()) {
            this.current = current;
        }
    }

    public int getLimit() {
        return limit;
    }

    public void setLimit(int limit) {
        if(limit >=1 && limit <= 100)
        this.limit = limit;
    }

    public int getRows() {
        return rows;
    }

    public void setRows(int rows) {
        if (rows >= 0) {
            this.rows = rows;
        }
    }
    public String getPath() {
        return path;
    }

    public void setPath(String path) {
        this.path = path;
    }

    //获取当前页的起始数据行
    public int getOffset(){
        // current * limit
        return (current-1) * limit;
    }

    //用于获取总页数
    public int getTotal(){
        // rows / limit
        if(rows % limit==0){
            return rows / limit;
        } else{
            return rows / limit +1;
        }
    }

    //获取起始页码
    public int getFrom(){
        int from = current-2;
        return from < 1 ? 1 : from ;
    }

    //获取结束页码
    public int getTo(){
        int to = current+2;
        return to > getTotal() ? getTotal() : to;
    }
}
